Invisible-impression printing.



PATENTED JUNE 9, 1903.

E. W. HALL.

INVISIBLE IMPRESSIO'N PRINTING. nrucnmu FILED MAB. 1, 1902.

WITNESSES: j. 2.

ATTORNEY,

UNITED STATES Patented June 9, 1903.

PATENT OFFICE.

EDWARD W. HALL, or RUTHERFORD, NEW JERSEY, ASSIGNOR, BY DIRECT ANDMESNEASSIGNMENTS, TO NEW ERA COMPANY, on NEW YORK, N. v,

A CORPORATION.

INVISIBLE-IMPRESSION PRINTING.

SPECIFICATION forming part of Letters Patent No. 730,823, dated June 9,1903.

Application filed March 1, 1902. Serial Nn. 96.229. (N model-T 1'0 allwhom it rnmy concern:

Be it known that I-, EDWARD W. HALL, a citizen of the United States,residing at Rutherford, in the county of Bergen and State of 5 NewJersey, have invented certain new and useful Improvements inInvisible-Impression Printing, of which the following is aspecification. 7

This invention relates to invisible-impres- IO sion printing, and hasfor its object to provide an improved process of printing in which afaintly visible and a substantially invisible representation areprinted,one over the other, upon the same surface, so that the develop-:5 ment of the invisible obliterates the visible.

In thedrawings, Figure 1 is a plan view showing the visible impressionprior to treatment of the impression-receiving surface to develop thenearly-invisible impression. Fig.

2 is a view similar to Fig, 1, showing the same after treatment of'theimpression-receiving surface to develop the nearly-invisible impression.

Corresponding parts in both figures are de- 2 5 noted by the' samereference characters.

My improved process consists in the formation of a visible impressionupon a suitable surface,which is a representation of some object at onetime or under certain circumstances or in a predetermined condition. Inext form a nearly-invisible impression upon the same surface of anobject related in time, form, development, or change to the visibleobject. Thelines of the nearly-invisible impression are made to conformsubstantially to the lines of the nearly-visible impression andarepreferably bolder than the lines of" The nearly-invisisuch visibleimpression. ble impression may subsequently be rendered visible bytreatment of the surface bearing the samevwith a lead-pencil, graphite,

ink, or other suitable-materials, or by the application ofcoloring-matter by friction, or by the application of heat, which willaffect the surface bearingthe nearly-invisible impression and thesurface adjacent to or surrounding said impression in a difierent manneror tea different degree. In forming the nearlyinvisible impressionsuitable sympathetic or invisible inks or chemicals are employed, and

these inks or chemicals may be applied to types, stereotypes, or otherimpression-pro ducing means and the operation of printing performed inthe customary manner. Aconvenieut material for producing suchnearlyinvisible impression on awhite ground has been found to becomposed of the following ingredients, to wit: One pound of white leadand one ounce of secatif drier reduced with boiled linseed-oil to theconsistency adapted to the substance to be treated. It will-beunderstood that adilferent consistency is required according to theabsorbent qualities of the substance upon which the impression is to bemade. This same ink or material may be used on colored grounds bycoloring it with a suitable coloring-matter. I When it is desired tobring the nearly-invisible impression into view, the surface of thepaper or other impression-bearing material is sub- 7 jected totreatmentby a lead-pencil, graphite, ink, or other color impartingdevice or material, and the particles of coloring-matter applied to theimpression-bearingsurface in this manner produce efiects upon'theportion of the surface bearing invisible impression and the portion ofthe surface which surround the nearly-invisible impression,so that thenearly,- invisible impression is brought out or developed in strongrelief. On account of the sub- 8c stantial conformity of the lines ofthe nearlyinvisible impression with the lines of the visi- 'bleimpression and the fact that the lines of the nearly-invisibleimpression are stronger and bolder than those of the visible impres' 8 5sion the visible impression is substantially obliterated or absorbed inthe development of the nearly-invisible impression, leaving only whatwas the nearly-invisible impression visible. 5

Referring to the drawings, 1 designates a sheet of white paper, uponwhich is visibly printed a representation 2 of'the first capitol of theUnited States and a nearly-invisible impression 3, showing the same inits present 5 condition. In Fig. 2 I have shown the same thing,- thenearly-invisibleimpression 3 having' been developed or made visible bythe frictional application of lead-pencil. In Fig. 2 some lines of thevisible impression are m still faintly traceable, as at 4, and betterillustrate the conformity of the two impressions and the etfect of thedevelopment of the nearly-invisible impression.

The novelty and usefulness of my process have already been establishedby the varied and manifold purposes to which it has already been appliedand the general demand for it. It is used to increase the security oftrade-marks by the nearly invisible printing of portions thereof, ofbottled goods by nearly invisibly printing portions of the labels; toaid education by nearly invisibly printing parts of the illustrationsoflessons or lectures, which have an important bearing in view of thefact that it is well known that things presented objectively to thesenses make a deeper impression than those merely heard or read and thefact that it adds anew interest, causing the operation of learning toassume somewhat the aspect of an interesting game; to the aid of scienceby visibly printing the form of a subject in one state and nearlyinvisibly printing the form of the same in another state, thereby veryforcibly impressing the development or change in the subject when thenearly-invisible impression is developed, and to many commercial uses,of which may be mentioned the extension of .the value of advertising byvisibly printing a primitive form of adevice and nearlyinvisiblyimprinting its improved form, thereby attracting attention tothe Wonderful change and the ad-' vantages of the new over the old. Itherefore do not desire to be understood as limiting myselfto anyspecific embodiment of the broad features of my newly-invented process,but reserve the right to all such modifications, variations, and formsas fall within the scope of my invention and the terms of the followingclaims.

Having thus described my invention, I claim and desire to secure byLetters Patent 1. As an improvement in the art of printing, theherein-described method consisting in producing upon the sameimpression-receiving surface a visible impression and a nearly-invisibleimpression, said visible and nearly-invisible impressions representingcorrelatively a transformation subject and saidnearly-invisibleimpression being printed or produced upon theimpression-receiving surface.in a substantially invisible or sympatheticmaterial capable of'development to visibility by treatment of thesurface with a pencil, crayon, or other material or substance which willproduce visibility, and sub: sequeutly developing the nearlyinvisibleimpression to substantially obliterate the visible impression and effecta transformation of the representation.

2. As an improvement in the art of printing, the herein-describedmethod, consisting in producing upon the same impression-receivingsurface, a visible impression, and a nearly-invisible impression, one ofsaid impressions being superimposed upon the other, and the lines of thenearly-invisible impression being heavier or bolder than the lines ofthe visible impression and subsequently developing the nearly-invisibleimpression to substantially obliterate the visible'impres- S10".

, As an improvement in the art of printing, the herein-described method,consisting in producing upon the same impression-receiving surface, avisible impression, and a nearly-invisible impression, one of saidimpressions being superimposed upon the other, andthe-lines of thenearly-invisible impression being heavier or bolder than the lines ofthe visible impression, and subsequently developing the nearly-invisibleimpression by treatment of the impression-receiving surface.

4. As an improvement in the art of. printing, the herein-describedmethod, consisting in producing upon the same impression-receivingsurface, a visible impression, and a nearly-invisible impression, one ofsaid impressions being superimposed upon the other, and the lines of thenearly-invisible impression being heavier or bolder thanthe lines of thevisible impression, and subsequently treating the impression receivingsurface with suitable coloring-matter, to develop the nearly-invisibleimpression.

5. As an improvement in the art of printing, the herein-describedmethod, consisting in producing upon the same impression-receivingsurface, a visible impression, and a nearly-invisible impression, one ofsaid impressions being superimposed upon the other,

and the lines of the nearly-invisible impression being heavier or bolderthan the lines of the visible impression, and subsequently coloring theimpression-recei'vingsurface to develop the nearly-invisible impression,and

substantially obliterate the visible impression.

6. As an improvement in the art of printf' ing, the herein-describedmethod, consisting in producing upon the same impression-receivingsurface, a visible impression, and a nearly-invisible impression, one ofsaid impressions being superimposed upon the other, and the lines of thenearly-invisible impression being heavier or bolder than the lines of.

visible impression and subsequently developing the nearly-invisibleimpression to substantially obliterate thevisible impression.

' 8. As an improvement inthe art of printing, the herein-describedmethod consisting in producing upon the same impression-receivingsurface a visible impression and a nearly-invisible impression, oneof'said impressions being superimposed upon the other and thenearly-invisible impression re presenting a transformation of thesubject represented by the visible impression and having the linesheavier or bolder than the lines of the visible impression andsubsequently developing the nearly-invisible impression to substantiallyobliterate the visible impression.

9. An impression-receiving sheet having produced upon its surface avisible impression and a nearly-invisible impression, one of saidimpressions being superimposed upon the other and the lines of thenearly-invisible impression being heavier or bolder than the lines ofthe visible impression, said nearlyinvislble impression being printed orproduced upon the surface of the sheet in asubstantially invisible orsympathetic material capable of development to visibility by treatmentof the surface with a pencil, crayon, or other material or substancewhich will produce visibility, whereby the nearly-invisible impressionwill be substantially obliterated by reason of the superimposed positionof said impressions and a transformation of the representation will beeffected.

10. An impression-receiving sheet having produced upon its surface avisible impression and a nearly-invisible impression, one of saidimpressions being superimposed upon the other and the nearly-invisibleimpression representing a subject germane to the subject represented bythe visible impression and having lines heavier or bolder than the linesof the visible impression, said nearlyin visibleimpression being printedor produced upon the surface of the sheet in a substantially invisibleor sympathetic material capable of development to visibility bytreatment of the surface with a pencil, crayon, or other material orsubstance which will produce visibility, whereby the nearly-invisibleimpression will be substantially obliterated by reason of thesuperimposed position of said impressions and a transformation of therepresentation will be-efiected.

11. An impression-receiving sheet having printed or produced upon itssurface a visible impression and a nearly-invisible impression, saidvisible and nearly-invisible impression representing correlatively atransformation subject and one impression being superimposed upon theother, the visible impression being capable of substantial obliterationby the development to visibility of the nearly invisible impression andsaid nearly-invisible impression being printed or produced upon thesurface of the sheet in a substantially invisible or sympatheticmaterial capable of development to visibility by treatment of the surface with a pencil, crayon, or other'material or substance which willpro duce visibility, whereby when the visible impression issubstantially obliterated by the development to visibility of thenearly-invisible impression a transformation of the representation willbe efiected.

In testimony whereof I have signed my name in the presence of thesubscribing witnesses.

EDWARD W. HALL. Witnesses:

HARTWELL P. HEATH, Joan M. HECTOR.

